We report that both shear and bulk moduli, not only shear modulus, are critical parameters involved in both homogeneous and inhomogeneous flows in metallic glass. The flow activation energy (δF) of various glasses when scaled with average molar volume V_m, which is defined as flow activation energy density ρ_E = δF/V_m, can be expressed as: ρE=10G+K11. The extended elastic model is suggestive for understanding the glass transition and deformation in metallic glasses.
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